An　experimental　study　on　the　torsional　behavior　of　two　1/6　scale　core　walls:　one　reinforced　concrete　core　wall　with　concealed　steel　trusses　and　steel　tube-reinforced　concrete　columns,　and　one　normal　reinforced　concrete　core　wall,　was　carried　out　under　eccentric　horizontal　cyclic　loading.　The　torsional　load-bearing　capacity,　torsional　angle　ductility,　torsional　hysteresis　characteristics,　torsional　stiffness　and　its　deterioration　process,　torsional　energy　dissipation　and　damage　characteristics　of　the　two　specimens　are　herein　discussed.　Results　show　that　the　torsional　performance　of　RC　core　walls　can　be　improved　by　embedding　the　concealed　steel　trusses　in　the　walls　and　setting　the　steel　tube-reinforced　concrete　columns　as　boundary-columns.